[selectors-4] Bikeshed cleanups

Author: Peter Linss

selectors/Overview.bs

@@ -1100,7 +1100,7 @@ Types of Pseudo-Elements</h4>
 Characters and case sensitivity</h3>
 
 	All Selectors syntax is case-insensitive within the ASCII range
-	(i.e. [a-z]  and [A-Z] are equivalent),
+	(i.e. [a-z]  and \[A-Z] are equivalent),
 	except for the following parts,
 	which are not under the control of Selectors:
 	the case-sensitivity of
@@ -1261,9 +1261,9 @@ The Negation Pseudo-class: '':not()''</h3>
 		For example, the following selector matches all <a element>button</a> elements in an HTML document
 		that are not disabled.
 
-		<pre>button:not([DISABLED]) </pre>
+		<pre>button:not(\[DISABLED]) </pre>
 
-		The following selector represents all but <a element title>FOO</a> elements.
+		The following selector represents all but FOO elements.
 
 		<pre>*:not(FOO)</pre>